You should either:
a) ban Caledonian;
b) let him write whatever he wants.
Censoring his posts is kind of nasty, because it looks like he can only express opinions you think worth posting.
Personally, I think you should choose (a), because his comments are boring, disruptive and useless, but if you don’t wanna do it, then go for (b).
And as for this: “Research help, in particular, seems to me to probably require someone to read all this stuff at the age of 15 and then study on their own for 7 years after that, so I figured I’d better get started on the writing now”, I think it’s kinda dumb, and it will never work out. If you keep hoping on something like that, somebody will get there first, and it probably won’t be a Friendly outcome.
So you should plow ahead, and perhaps not be so arrogant as to think that no one else on the planet right now can help you with the research. There’re plenty of smart guys out there, and if they have access to the proper literature, I’m sure you can find worthy contributors, instead of waiting 7 more years.